Driving device for the transmission of power by rolling elements, especially for driving timing mechanisms of tachometers



June24, 1941. K, REZSNY 2,246,538 DRIVING DEVICE FOR THE TRANSMISSION OFPOWER BY ROLLING ELEMENTS, ESPECIALLY FOR DRIVING" TIMING MECHANISMS OFTACHOMETERS Filed June 13, 1939 Patented June 24, 194i DRIVING DEVICEFOR THE TRANSMISSION OF POWER BY ROLLING ELEMENTS, ESPE- CIALLY FOR-DRIVING TIMING MECHA- NISMS OF TACHOMETERS Koloman Rezsny, Budapest,Hungary Application June 13,1939, Serial No. 278,924

In Hungary May 31, 1935 2 Claims.

This invention relates to a driving device for the timing mechanism oftachometers and to measuring or recording devices in general, whichindicate what performances take place in a certain period of time.

The drive of such timing mechanisms is effected according to theinvention in that a rotor, continually driven by a source of energy withexcess of power, drives the timing mechanism, equipped to take up onlyacertain output in a unit of time, by means of rolling elements so ar-'ranged that the rolling resistance between the rotor and the timingmechanism acts exclusively as power transmission.

The invention renders such mechanism free from the use of windingsprings. Because this driving device substitutes the power of a rotorfor that of the winding springs hitherto used, it isindependent of humaninfluences as it is not wound by hand. Consequently, this driving deviceis particularly suitable in cases where, for example in industrialplants, the task is given to fulfill a certain purpose by a strongtiming mechanism, for example to control the measuring mechanism of atachometer or to drive a timing mechanism or to operate a recording bandfor the whole working period during which something is performed.

The invention enables in suitable instances I even the drive by thefluid (steam, compressed air or the like) which has actually to becontrolled. Thus, the driving powerfor this. high speed motor of atiming mechanism is supplied for example in the case of a compressorplant, by a small air turbine fed from the compressor plant, in a steamboiler plant by a small steam turbine, in a pumping station for exampleby a small Pelton-turbine and in an electricity plant by a smallelectric motor. The vacuum produced may also serve as driving medium,for example in that the air is drawn through a small nozzle in front ofthe air turbine taking the place of the winding spring. Of the largenumber of possibilities which cannot be enumerated separately, allsolutions come within the scope of the invention. in which a high speedmechanical element driven by a fluid or electric current'and taking theplace of the winding springsimparts a slow rotary movement to the shaftof a timing mechanism by interposed balls or rollers.

The exclusive use of rolling friction according to the invention fordriving the timing mechanism only taking up a certain output in aunitationsvin the source of driving energy, for example a turbine.

Two of the many possible embodiments of the- A so-called time shaft 3 ismounted in a vcasing between bearing screws 2, 2 (Fig. 1). The timeshaft carries a toothed wheel 4 which meshes with a toothed wheel 5 of aso-called anchor escapement 6 or the like, which ensures regularmovement of Ithe time shaft 3.

The time shaft 3 also carries a bevel wheel I which meshes with a' bevelwheel l0 keyed on shaft 8 of a counting mechanism 9 so that the numberof rotations ofthe time shaft 3 is transmitted to the counting mechanismto enable the time of movement of the time shaft to be ascertained.

A large, toothed wheel sits loosely on the time shaft 3 and meshes witha small toothed wheel |2 keyed on a counter shaft l4 mounted in bearingscrews 5. This counter shaft It also carries a large toothed wheel I 3cooperating with a small toothed wheel I 6 keyed on a driving rotorshaft l8 mounted between bearin screws II. This shaft l8 extends freelythrough the high speed air turbine2| and counter element'25. Y

The toothed wheel I6 is made in one piece with a disc l9 keyed on theshaft I8.

A disc 20 is keyed on the shaft l8. Between the two discs l9 and 20 thetwo above mentioned elements that is the. turbine 2| and counter element25 and also a disc 22 are located. Balls 34 and 34a are arranged betweenthe disc 20 and turbine 2| and between the two discs l9 and 22respectively, so that only the rolling friction of the'halls actsbetween these parts. This friction is sufilcient for driving the timingmechanism, as has been proved in practice.

The hub 23 of theturbine 2| has a tongue 24 and the counter element 25has a'n incision 26 in which the tongue 24 engages so that the turblne2| and the counter element 25 always rotate together yet are independentof one another in axial direction. The turbine 2| and the counterelement 25"ar e held apart by a pressure spring 21 and pressed. againstthe balls 34 and '34:; respectively and consequently directly againstthe discs 20 and I9 respectively.

In, for example, a compression plant to be controlled, compressed airflows through the conduit 29, nozzle holder 30 and nozzle 28.on to theturbine 2| (see also Fig.2) this turbine is set in rotation. By therolling friction produced under the action of the pressure spring 21 bythe balls 34 and 340. between the parts20 and 2| and I3 and 22respectively, rotary movement is imparted to the turbine shaft l3 andthrough the intermediary of the gear wheels I6, I 3, I2, H to the timeshaft 3.

To enable the time shaft to follow intermittently the movement of theanchor escapement without retardation, separate accumulating springsknown in watchm'aking are arranged on the time shaft, for example in thefollowing manner:

The toothed wheel ll sits loosely on the time shaft 3 and a thin flatspring 32 extends through might be arranged in the escapement wheel oftheanchor escapement 6; It is evident, that the accumulating spring maybe of various shapes, it may consequently be a tension or compressionhelical spring.

- Although the turbine 2| as driving rotor has a high speed of rotation,its shaft l8 runs relatively slowly so that its bearings may be of verysimple construction.

In the form of. construction shown in Fig. 3 a high speed toothed wheelv35 is used instead of the turbine wheel and meshes with a small toothedwheel 36 of an electric motor 31. The shaft of the electric motor isiournalled at its upper andlower ends in bearings 38 secured to thecasing wall I with the motor housing by means of a. bracket 39. Electriccurrent is fed to the electric motor 31 ibyfthe wires Mil, 4| and themotor drives the above described time movement by means of the toothedwheel 35. In all other respects the arrangement corresponds to thatillustrated in Fig. 1; only the toothed wheel 35 is substituted for theturbine wheel 2|. toothed wheel 35 is the driving element running at ahigh speed.

1. A driving device with power transmission by rolling elements,especially for driving the timing mechanism for tachometers of the typein which capable of taking up only a predetermined output in a unitoftime and with rolling elements between said rotor and said timingmechanism for transmitting the movement of said rotor to said timingmechanism by rolling friction, comprising in combination with the rotor,a counter-element positively connected for rotation with but axiallyshifted'relative to the rotor, a spring pressing apart said rotor fromsaid counter-element, a

\ driving shaft of the timing mechanism, two shoulders on said shaft,two sets of freely rolling bodies arranged between the rotor and thetiming mechanism on-the facing sides of said shoulders, one

'set of rolling bodies pressed against the rotor and the otherset-against said counter-element by said spring. 0

2. A driving device as specifiedin claim 1, in which the shoulders andthe sets of freely rolling bodies are constructed asbearings for therotor and for the counter-element.

KOLOMAN REZSNY.

In this instance the

